docs(docs-infra): fix wrong mention of the parent component instead of child one (#50898)

replace the word Parent with Child in the code example since it's the child component that should be mentioned at this level of the code

PR Close #50898

aio/content/guide/hierarchical-dependency-injection.md

@@ -476,7 +476,7 @@ In the logical tree, this is represented as follows:
     <app-child @Provide(FlowerService="🌻")
                @Inject(FlowerService)=>"🌻"> <!-- search ends here -->
       <#VIEW> <!-- search starts here -->
-        <h2>Parent Component</h2>
+        <h2>Child Component</h2>
         <p>Emoji from FlowerService: {{flower.emoji}} (🌻)</p>
       </#VIEW>
     </app-child>